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DIRECTED
ENERGY
PROFESSIONAL
SOCIETY
Abstract: 24-Systems-075
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UNCLASSIFIED, PUBLIC RELEASE
Investigating Phase Retrieval for Atmospheric Wavefront Sensing with Tiled Arrays
Wavefront sensing of optical fields in the atmosphere is a vital area for adaptive optics, free-space optical communication, power beaming, and directed energy. Wavefront sensors that can access the complex-valued optical field (e.g., self-referencing interferometers and digital holography) are highly desirable as they provide more information about the atmosphere than traditional phase-gradient based wavefront sensors. Phase retrieval is one such technique that grants access to the complex-valued optical field. This study explores different phase retrieval techniques for wavefront sensing and, in particular, explores phase retrieval in the context of coherent beam combination (CBC). Tiled arrays, which are one specific design of a CBC system, only require knowledge of the phase over distinct (and usually disparate) laser emitters in the pupil plane of a high energy laser system. The existing literature on phase retrieval suggests that phase retrieval algorithms converge more quickly when the phase is estimated over a segmented support function, and we explore whether that fact holds true for atmospheric wavefront sensing with tiled arrays. This would give phase retrieval a leg-up as a wavefront sensor for CBC.
UNCLASSIFIED, PUBLIC RELEASE
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